By Kohki Takatoh
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Extra info for Alignment technologies and applications of liquid crystal devices
Baking The baking process consists of two stages, pre-baking and hard-baking. 2 Characteristics of alignment materials on the market. 6 TFT-parallel TFT-parallel TFT-parallel TFT-parallel TFT-parallel TFT-parallel TFT-parallel TFT-parallel TFT-parallel Vertical Vertical Vertical Vertical STN STN STN STN Nissan Chem. 8 Hitachi Chem.
Suspected solid impurities can be confirmed by microscopic observation when a defect is found, but volatile impurities cannot be seen. Such impurities are attached to the substrates before the alignment layer coating step, blocking the polyimide, and this affects the alignment process. These defects cannot be detected without applying a voltage. 40 Masaki Hasegawa 2. Pretilt angle fluctuation Pretilt angle fluctuations may be caused by variations in the dispersion speed of the polyimide solvent, or caused by unevenness in the rubbing strength.
5 nm from the results of the thickness dependency measurements of the IR dichroism. This depth is in good agreement with Aerle’s estimate . 5 nm in depth, and it was assumed that the alignment layer was reoriented uniformly by the rubbing in the analysis of the results . The relationship between the pretilt angle of the LC and the tilt angle of the main chains of PMDA-ODA, with different lengths of alkyl chain, was studied, and the generation of the pretilt angle of the LC was discussed [41, 54, 59].